Maintenance of granite, marble and natural stone

How often you should seal your granite, marble, and other natural stone countertops depends on several factors, including the type of stone, its level of daily use, and exposure to substances that can stain the surface. Here are some general recommendations:

Granite: Granite is relatively less porous than marble, which means it does not need to be sealed as frequently. Generally, it is advisable to seal granite countertops once a year, but if your countertop is in a high-use area or exposed to a lot of acidic or coloring substances, you may need to do it more often.

Marble: Marble is more porous and more likely to absorb liquids, which can lead to staining and erosion. It is recommended to seal marble countertops every 6 months to a year, depending on usage. If you notice that water is no longer beading on the surface but is starting to soak in, that’s a sign that it’s time to re-seal.

Other Natural Stones: Other natural stones like quartzite and shale can also benefit from regular sealing. As with granite and marble, the frequency will depend on the porosity of the stone and the use of the countertop. Once a year is a good rule of thumb, but always watch for signs of water absorption.

When it comes to cleaning natural stone countertops such as granite, marble, or quartzite, it is crucial to choose the right products to avoid damaging the surface. Here’s a guide on which cleaning products are safe to use and which ones to avoid:

Safe Cleaning Products for Natural Stone

• Mild soapy water: Using warm water mixed with a mild soap (such as non-abrasive dishwashing liquid) is often sufficient for daily cleaning.
• Specific stone cleaners: Opt for cleaning products specially designed for natural stone. These products are formulated to be gentle and effective without risking degrading the sealer or damaging the stone.
• Microfiber Cloths: To wipe surfaces, use microfiber cloths that clean effectively without scratching.

Products to Avoid

• Vinegar, lemon juice or other acidic cleaners: Acids can etch marble and limestone and damage the finish of these stones.
• Ammonia or bleach-based cleaning solutions: These products can be too harsh and discolor or dull the surface of the stone.
• Scouring Powders and Abrasive Sponges: Abrasive cleaners can scratch the surface of stone, especially softer stones like marble.
• Greasy or oil-based soaps: These types of soaps can leave a residual film on natural stone, which attracts dirt and can contribute to the breakdown of the sealer.

Natural stone countertops, such as granite, marble, quartzite, and others, are generally known for their durability and strength. However, while these materials can withstand a certain amount of heat, they are not completely impervious to high temperatures. Here are the impacts of heat and hot objects on natural stone countertops:

Risk of Thermal Cracks: Natural stone expands when exposed to heat. If this heat is applied unevenly or too quickly (such as placing a hot dish directly on the surface), it can cause thermal stress cracking in the material.

Discoloration: Certain minerals in natural stones can react to excessive heat by changing color. This is especially true for lighter stones like marble, which can yellow or turn gray from heat.

Sealer Deterioration: Most natural stone countertops are sealed to protect them from stains and other damage. Excessive heat can deteriorate this sealer, reducing its ability to protect the stone. Heat can also affect the polish of the surface, making it dull or weathered in places.